The Seventymile River Placer is a gold mine located in Alaska.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
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MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Seventymile River Placer MRDS details
Site Name
Primary: Seventymile River Placer
Commodity
Primary: Gold
Location
State: Alaska
District: Eagle
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1902
Year Last Production: 1939
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
Not available
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Type: R
Description: Tintina Fault
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: FINENESS 828 PARTS AU AND 163 PARTS AG. SEE REF. 3, P. 254-255.
Materials
Ore: Gold
Comments
Comment (Development): CONSIDERABLE MINING IN EARLY YEARS IN SEVENTYMILE RIVER VALLEY; IN 1936 NEARLY ALL MINING ON TRIBUTARIES.
Comment (Deposit): THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.
Comment (Deposit): RIVER GRADIENT ABOUT 50 FT. PER MILE. LOCATION DESCRIPTION FOR ENTIRE LENGTH OF SEVENTYMILE RIVER IN EAGLE (D-2) AND ALONG S.R. NEAR MOUTH OF DEEP CR. IN EAGLE (D-3). ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT
Comment (Deposit): GOLD MINED ON RIVER BARS AND ON LOW BENCHES IMMEDIATELY ABOVE FALLS AND FOR SOME DISTANCE UPSTREAM. GOLD FROM NEAR MOUTH OF BROKEN NECK CR. CONTAINED ALLOYED PLATINUM.
Comment (Geology): 9 FT. HIGH FALLS WHERE RIVER FLOWS THROUGH SCHIST TO REACH CUT IN TERTIARY CONGLOMERATE. SEVENTYMILE RIVER FOLLOWS TRACE OF TINTINA FAULT IN EAGLE (D-2) ; MAJOR.UNITS: RIVER HEADS IN GRANITIC TERRANE; FLOWS THROUGH METAMORPHOSED ROCKS TO FALLS; FLOWS THROUGH TERTIARY SEDIMENTARY ROCKS FOR MOST OF COURSE BELOW FALLS; CARBONIFEROUS ROCKS AT MOUTH. ; REG.COM: GOLD PROBABLY DERIVED FROM QUARTZ VEINS AND OTHER MINERALIZED AREAS RELATED TO CHARLIE RIVER BATHOLITH.
Comment (Location): USGS MF-393, LOC. 19,23-25,28. COORDINATES GIVEN ARE FOR SEVENTYMILE RIVER FALLS, A SERIES OF RAPIDS. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).
References
Reference (Deposit): USGS MF-393 (D-2, 3), LOC. 19, 23-25, 28.
Reference (Deposit): USGS BULL. 897-C, P. 191-195
Reference (Deposit): USGS BULL. 917-D, P. 254-255
The Top Ten Gold Producing States
These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.
